|  | 4.3 | Layer 1 Design
| 4.3.4 | 10BASE-T and 100BASE-TX ethernet

Fast Ethernet is Ethernet that has been upgraded to 100 Mbps. This type uses the standard Ethernet broadcast-oriented logical bus topology of 10BASE-T, along with the familiar CSMA/CD method for Media Access Control (MAC). The Fast Ethernet standard is actually several different standards based on copper-pair wire (100BASE-TX) and on fiber-optic cable (100BASE-FX), and it is used to connect the MDF to the IDF.
| Threaded Case Study
Washington Project: LAN Wiring Scheme Requirements

As you're planning the wiring for the sites of the Washington School District network, you need to take into account certain LAN requirements related to user access, segmentation, infrastructure, cabling, MDFs, and IDFs. Therefore, you should address the requirements described here when designing the network.

Requirement 1
Two LAN segments need to be implemented in each school and the district office. One LAN needs to be designated for student/curriculum usage and the other needs to be designated for administration usage.

Requirement 2
The LAN infrastructure needs to be based on Ethernet LAN switching, which will allow for a migration to faster speeds (that is, more bandwidth) to the individual computers and between MDFs and IDFs without revamping the physical wiring scheme to accommodate future applications. The transport speeds need to be Ethernet 10BASE-T, 100BASE-TX, and 100BASE-FX.

Requirement 3
Horizontal cabling needs to be Category 5 UTP and needs to have the capacity to accommodate 100 Mbps. Vertical (backbone) cabling needs to be Category 5 UTP or fiber-optic multi-mode cable. The cabling infrastructure needs to comply with TIA/EIA-568-A and TIA/EIA-569 standards.

Requirement 4
In each location, an MDF room needs to be established as the central point to which all LAN cabling will be terminated. This will also be the point of presence (POP) for the WAN connection. The IDF should service its geographical area, and the IDF should be connected directly to the MDF in a star or extended star topology.

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